Effect of addition of Si on thermal and electrical properties of Al-Si-Al2O3 composites

2017 Global Conference on Polymer and Composite Materials

材料科学;化学

Cao, R.^1 ; Jiang, J.X.^1 ; Wu, C.^2 ; Jiang, X.S.^2

School of Mechanical Engineering, Chengdu Textile College, Chengdu

611731, China^1

School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu

610031, China^2

关键词: Effect of addition;    Interfacial thermal resistance;    Low thermal expansion;    Reactive synthesis;    Silicon contents;    Thermal and electrical properties;    Thermal expansion coefficients;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/213/1/012001/pdf
DOI  :  10.1088/1757-899X/213/1/012001

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Al-5wt.%Si-Al2O3, Al-10wt.%Si-Al2O3, Al-20wt.%Si-Al2O3composites were fabricated by powder metallurgy and in-situ reactive synthesis technology. The impact of the addition of Si on the thermal and electrical properties was tested and analysed for vary in silicon content in Al-Si-Al2O3composites. Results show that both thermal expansion coefficient and thermal conductivity decreased as silicon content increased because Si and Al2O3dispersed in the Al matrix uniformly to suppress the high thermal expansion of Al to a large extent as well as the interfacial thermal resistance which led to the decline in thermal conductivity. Electrical resistivity increased when silicon content was increased because low thermal expansion coefficient particles of Si and Al2O3severely damaged the continuity of the Al matrix which hindered movement of electron in the matrix.